What is the steepest grade you've climbed?

Have done Sonora Pass many times. With the '01 RAM HO-CTD, 4.10's, and a 6 speed manual trans, with the camper on, we were down to 2nd gear for one of those long switchbacks, the one that is actually 26 %. In 1st gear, low range 4WD, I've climbed what I think was about 40% grade, not quite half way to the perpendicular in a short 35 foot pitch on solid granite near the start of the Rubicon with the truck and camper pulling the jeep on car trailer, about 16.5K pounds worth, arriving on top at a fairly flat place for a good night's sleep. The good news is nothing broke. After unloading the jeep and doing the Rubi and putting it back on the car trailer, I had to back down the same grade turning the trailer when I got nearer the exit trail. Recently in the Anza Borrego Desert we pulled quite a few sand hills. Click this short m4v link to see the grade coming out of the Fish Creek drainage. Watch to the end to see the grade differential.
https://www.dropbox.com/s/y9nfstvqf6hk4ab/up%20Fish%20Cr.%20Anza.m4v?dl=0
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